Dr. Oz says healthy families are ones who incorporate physical activity into their family life. One way to do this is by getting a dog and walking it together. In the Oz household, the family works up a sweat playing Dance Dance Revolution, an interactive video game that makes players move their feet to the beat. "It's a cool little game," he says.

You can also take family walks. "If you're putting 500 more steps [or about a quarter-mile] into your life every single day, that's a lot of extra calories you'll get rid of," Dr. Oz says. "That's the kind of health-promoting habit you'll take into adulthood."

One thing you should be sure not to do is to hit the couch right after meals. "You'll actually change your metabolism," Dr. Oz says. "Those are the kinds of moves that will change America's health."